Daikin REYQ168 Installation Manual Page 26

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Installation SiUS39-506
20 General Information
3.2.3 Refrigerant Pipe Work
Operational steps
The 3 Principles
of Refrigerant
Piping
The 3 principles of refrigerant piping must be strictly observed
Fit pipes
provisionally
Install indoor unit
Solder Flushing Air tight test Vacuum drying
Cut pipes to size Replace nitrogen
(V0963)
The 3 principles of refrigerant piping
Dry Clean Air tight
Make sure there is no moisture inside
the pipes
Make sure there is no dirt inside the
pipe
Make sure the refrigerant does not
leak out
Actoin to avoid problemCause of problem
Rainwater, work water,
etc. gets into pipes from
outside
Moisture generated inside
pipes due to condensation
Formation of oxides inside
pipes during soldering
Dirt, dust or other
extraneous material gets
into pipes from outside
Leak from soldered area
Leak from flared area
Leak from flange area
Pipe covering Flushing
Replace nitrogen
Pipe covering
Air tight test
Flushing
Vacuum drying
Use the proper materials (copper pipe,
solder, etc.)
Adhere strictly to standard soldering
work practice
Adhere strictly to standard flaring work
practice
Adhere strictly to standard flange
connection work parctice
Clean
Dry
Air tight
(V0964)
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